function getStyle(obj,name){
    if(obj.currentStyle){
        return obj.currentStyle[name]
    }
    else{
        return getComputedStyle(obj,false)[name];
    }
}


function startMove(obj,attr,iTarget){
    clearInterval(obj.timer);
    obj.timer=setInterval(function(){
    var cur = 0;
    if (attr =='opacity'){
        cur =Math.round(parseFloat(getStyle(obj,attr))*100);
    }
    else{
        cur =parseInt(getStyle(obj,attr));
    }   
        var speed=(iTarget-cur)/6;
        speed=speed>0?Math.ceil(speed):Math.floor(speed);
        if (cur == iTarget){
            clearInterval(obj.timer)
        }
        else{
            if(attr=='opacity'){
                obj.style.opacity=(cur+speed)/100;
                obj.style.filter='alpha(opacity:'+(cur+speed)+')';
                }
            else{
                obj.style[attr]=cur+speed+'px';
            }
        }
    },30)
}

//添加左右菜单
function getByClass(obj,name){
    var aEle=obj.getElementsByTagName('*');
    var aRe=[];
    for (var i=0;i<aEle.length;i++){
        if(aEle[i].className==name){
        aRe.push(aEle[i]);
        }
    }
    return aRe;
}

